Cause:
Data cables and power cords are sometimes installed in close proximity or may overlap.

Resolution:

The ANSI/TIA-569-C standard speaks directly to the separation of telecommunications and power cables. The recommended distance can vary. Please see ANSI/TIA-569-C.
Anixter has posted a document titled *Anixter Standard Reference Guide that includes excerpts from ANSI/TIA-569-C. In this guide, pages 67 - 68 speak specifically to this question: https://www.anixter.com/en_us/resources/literature/technical-references/standards-reference-guide.html

*This document is not intended to be a substitute for the original standards documents. For a complete copy of any topic in the Guide, please refer to the original standards documents. There is a section in this guide "Reference Documents" where you will find instructions on how to order a current copy of these standards.